mirror of https://gitee.com/openkylin/linux.git
113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/*
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* vimc-core.h Virtual Media Controller Driver
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*
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* Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _VIMC_CORE_H_
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#define _VIMC_CORE_H_
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#include <linux/slab.h>
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#include <media/v4l2-device.h>
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/**
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* struct vimc_pix_map - maps media bus code with v4l2 pixel format
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*
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* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
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* @bbp: number of bytes each pixel occupies
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* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
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*
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* Struct which matches the MEDIA_BUS_FMT_* codes with the corresponding
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* V4L2_PIX_FMT_* fourcc pixelformat and its bytes per pixel (bpp)
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*/
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struct vimc_pix_map {
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unsigned int code;
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unsigned int bpp;
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u32 pixelformat;
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};
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/**
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* struct vimc_ent_device - core struct that represents a node in the topology
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*
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* @ent: the pointer to struct media_entity for the node
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* @pads: the list of pads of the node
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* @destroy: callback to destroy the node
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* @process_frame: callback send a frame to that node
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*
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* Each node of the topology must create a vimc_ent_device struct. Depending on
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* the node it will be of an instance of v4l2_subdev or video_device struct
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* where both contains a struct media_entity.
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* Those structures should embedded the vimc_ent_device struct through
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* v4l2_set_subdevdata() and video_set_drvdata() respectivaly, allowing the
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* vimc_ent_device struct to be retrieved from the corresponding struct
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* media_entity
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*/
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struct vimc_ent_device {
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struct media_entity *ent;
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struct media_pad *pads;
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void (*destroy)(struct vimc_ent_device *);
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void (*process_frame)(struct vimc_ent_device *ved,
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struct media_pad *sink, const void *frame);
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};
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/**
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* vimc_propagate_frame - propagate a frame through the topology
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*
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* @src: the source pad where the frame is being originated
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* @frame: the frame to be propagated
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*
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* This function will call the process_frame callback from the vimc_ent_device
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* struct of the nodes directly connected to the @src pad
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*/
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int vimc_propagate_frame(struct media_pad *src, const void *frame);
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/**
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* vimc_pads_init - initialize pads
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*
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* @num_pads: number of pads to initialize
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* @pads_flags: flags to use in each pad
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*
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* Helper functions to allocate/initialize pads
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*/
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struct media_pad *vimc_pads_init(u16 num_pads,
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const unsigned long *pads_flag);
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/**
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* vimc_pads_cleanup - free pads
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*
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* @pads: pointer to the pads
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*
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* Helper function to free the pads initialized with vimc_pads_init
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*/
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static inline void vimc_pads_cleanup(struct media_pad *pads)
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{
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kfree(pads);
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}
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/**
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* vimc_pix_map_by_code - get vimc_pix_map struct by media bus code
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*
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* @code: media bus format code defined by MEDIA_BUS_FMT_* macros
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*/
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const struct vimc_pix_map *vimc_pix_map_by_code(u32 code);
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/**
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* vimc_pix_map_by_pixelformat - get vimc_pix_map struct by v4l2 pixel format
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*
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* @pixelformat: pixel format devined by V4L2_PIX_FMT_* macros
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*/
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const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat);
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#endif
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